Bacteria

Group A Beta-hemolytic Streptococcus

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Group A Beta-hemolytic Streptococcus, Group A Streptococcus, Streptococcus Pyogenes

  • Epidemiology
  1. Group A Streptococcus results in 700 million infections and complicated by 500,000 deaths each year worldwide
    1. Carapetis (2005) Lancet Infect Dis 5(11): 685-94 [PubMed]
  2. Post-streptococcal complications have become uncommon in the United States
    1. Complications are more common in Sub-Sahara Africa, India, Australia, New Zealand
  • Pathophysiology
  • General
  1. Anaerobic Gram Positive Cocci
  2. Humans are only reservoir
  3. Antibiotic management of Streptococcal Pharyngitis and decreases Rheumatic Fever risk
    1. However, does not prevent Post-Streptococcal Glomerulonephritis
  4. Autoimmune complications arise from Antibody formation against streptococcal M protein
    1. Immune complex deposition in Post-Streptococcal Glomerulonephritis
    2. Antibody directed reaction in Acute Rheumatic Fever
    3. Autoantibody cross-reaction to Basal Ganglia in Sydenham Chorea